Heat exchanger



Nov. 12, 1957 G. GOBEL mn- EXCHANGER Filed Oct. 5, 1951 Nut r I M m 22 mY rt 1 m \w 2 u m 0 m RM Mn 2 m 4 5 M WA w n .m &\ v I I. UQ k xm vUnited States Patent HEAT EXCHANGER Gerhard Giibel, Darmstadt, GermanyApplication October 5, 1951, Serial No. 249,997

1 Claim. (Cl. 257-138) The present invention relates to heat exchangersof a new and improved design.

The heat exchanger according to the present invention is designed forhighest efiiciency from a technical as well as from an economic point ofview, independently of whether the operating pressure difference isartificially .created, as by fan action, or arises naturally from anupdraft or a thermosyphonic action.

Generally speaking, the invention relates to a heat exchanger forflowing media having heat exchange surfaces comprising a plurality offlat bodies as main heat exchange elements, said bodies being arrangedto form a substantially parallel grid and being spaced at smalldistances from each other to leave short gaps therebetween, said gapsbeing so dimensioned as to utilize the prevailing friction-pressure dropfor optimum heat exchange.

In the drawings,

Fig. 1 is a cross section through a convector on line 11 of Fig. 2, and

Fig. 2 shows a front view, partly in section along line 22 of Fig. 1.

According to the invention, the rear boundary of the diffuser adjacentto the heat exchange element may be a separate unit and may be movablyarranged in such a way that in one position the shaft or duct above theheat exchange element is completely closed thereby; it can thus be usedas a regulating element toward the atmosphere. By this movable rearwall, which may have an additional heat insulation, the heat radiationof the heating surface toward the fixed rear wall is largely absorbedand is transmitted to the air by convection. The front boundary of thedifiusor can likewise be formed by a separate unit, which may form anevaporation vessel that can be tilted to the front or removed. Afterremoval, an opening will be free for cleaning the inside.

The heat exchange element with adjacent ditfusor, if desired, formed bythe regulating flap and the evaporation vessel, may be a separate unitthat can be built in by simple insertion and which does not require aseparate design of the shaft. The assembly of these parts is verysimple.

Referring now to the drawings in detail, numeral 33 designates hollow,horizontally arranged heat exchange bodies. The bodies have awing-shaped profile and are exposed to the impact of the heating meansat the inside.

The flat heat exchange bodies 33, together with the two lateral plates49, the containers 59, which are provided with heating medium admissionpipe 57, and discharge pipe 58, form the heat exchange element. Thisheat exchange element forms a complete unit with the short diifusorcontaining the regulating flap 37 and the evaporating vessel 35. Theunit can also be used without the casing.

Due to the fan-shaped arrangement of the heat ex- 2,812,926 PatentedNov. 12, 1957 ICC change bodies 33, the air current is likewisefan-shaped. The short diffusor is created by the curved walls of theevaporator 35 and the regulating flap 37. The highly accelerated airflow in the gaps between heat exchange bodies 33 is reconverted intopressure without essential loss, due to the diffuser action. Theevaporating vessel 35 is supported at both ends by the angular member 46on the projection 47 which is attached to the side plate 49. The vesselmay be tilted on the pivot point 36, as indicated by broken lines 35(Fig. 1). Evaporation of water contained in vessel 35 is enhanced by aircirculation indicated at auxiliary inlet 60, which circulation is causedby the underpressure in the shaft. Numeral 37' indicates the regulatingflap in closed position.

The regulating flap has counterbearings 40 which are open toward thebottom and are supported on edgeshaped bearings 38 mounted in the sidewalls. A flexible strap 41 provides a safe gasket in closed position.The counter-weight 42 and the proper position of the point of suspensionprovide a force-free action by means of a roller 39. The insulation ofthe double-walled regulating flap is designated by 43. The fixed frontwall 44 of the shaft lining lies parallel to the rear wall. The bafileprofiles 45 at the outlet are arranged in fan-shape with decreasingdeflecting angles toward the rear wall. In order to enlarge the exitopening, so as to decrease the energy at the outlet, it may be extendedto the upper part of the front wall. It is advantageous for this purposeto have the horizontal exit plane merge in a rounded countour 56 intothe front wall in order to create favorable fiow conditions. It islikewise advantageous to make the front boundary in the bottom partslope back to a point designated by 57 in the drawing. The front part ofthe evaporation vessel 35 may be provided with a mask so that the heatexchange element with the diffusOr can be used as a separate unit.

The evaporating vessel 35 is supported by angles 46 on projectingelements 47 which are joined by screws to lateral members 49.

The bent-back portions 50 of angles 46 prevent an automatic slipping-outof the evaporation vessel in the open position by engaging behind theprojections 47.

While, in the foregoing, the heat exchange device according to theinvention has been described and illustrated in a number of embodiments,it should be understood that the example given is by way of illustrationonly and that there are many modifications of the same possible withoutdeparting from the spirit of the invention.

Having thus described my invention, I claim:

A heat exchanger comprising in combination, a casing formed with a frontwall, a rear wall, side walls and top, said front wall being providedwith a primary air inlet; a convector unit in said casing, said unitcomprising a plurality of substantially flat parallel hollow streamlinedfins defining internal passages for a conditioning medium and havingturbine blade-like profiles the inner edges whereof define a concavesurface from said primary air inlet, a humidifier adju-stably pivotablydisposed in said front wall, above said primary inlet, pivot means forpivoting said humidifier in said front wall, an auxiliary air inlet insaid front wall disposed above said humidifier and said convector unit,a pivotable flap intermediate said rear wall and said parallelstreamlined fins for regulating the flow of air, pivot means in saidwall for pivoting said flap, and an air outlet in said top of saidcasing.

{References on following page) UNITED STATES PATENTS Wentworth Nov. 12,1932 Modine Feb. 7, 1933 Hart Nov. 14, 1933 Govers May 8, 1934 TraneJuly 30, 1935 4 Campbell Oct. 27, 1936 Palmer June 23, 1942 Coons Apr.27, 1943 Budlane June 3, 1947 Goodyer Dec. 9, 1947 Wenger Oct. 26, 1948Friedman June 20, 1950

